src/Protocol/ActivityPub.php

   1 <?php
   2 /**
   3  * @file src/Protocol/ActivityPub.php
   4  */
   5 namespace Friendica\Protocol;
   6
   7 use Friendica\Database\DBA;
   8 use Friendica\Core\System;
   9 use Friendica\BaseObject;
  10 use Friendica\Util\Network;
  11 use Friendica\Util\HTTPSignature;
  12 use Friendica\Core\Protocol;
  13 use Friendica\Model\Conversation;
  14 use Friendica\Model\Contact;
  15 use Friendica\Model\APContact;
  16 use Friendica\Model\Item;
  17 use Friendica\Model\Profile;
  18 use Friendica\Model\Term;
  19 use Friendica\Model\User;
  20 use Friendica\Util\DateTimeFormat;
  21 use Friendica\Util\Crypto;
  22 use Friendica\Content\Text\BBCode;
  23 use Friendica\Content\Text\HTML;
  24 use Friendica\Util\JsonLD;
  25 use Friendica\Util\LDSignature;
  26 use Friendica\Core\Config;
  27
  28 /**
  29  * @brief ActivityPub Protocol class
  30  * The ActivityPub Protocol is a message exchange protocol defined by the W3C.
  31  * https://www.w3.org/TR/activitypub/
  32  * https://www.w3.org/TR/activitystreams-core/
  33  * https://www.w3.org/TR/activitystreams-vocabulary/
  34  *
  35  * https://blog.joinmastodon.org/2018/06/how-to-implement-a-basic-activitypub-server/
  36  * https://blog.joinmastodon.org/2018/07/how-to-make-friends-and-verify-requests/
  37  *
  38  * Digest: https://tools.ietf.org/html/rfc5843
  39  * https://tools.ietf.org/html/draft-cavage-http-signatures-10#ref-15
  40  *
  41  * Mastodon implementation of supported activities:
  42  * https://github.com/tootsuite/mastodon/blob/master/app/lib/activitypub/activity.rb#L26
  43  *
  44  * To-do:
  45  * - Polling the outboxes for missing content?
  46  */
  47 class ActivityPub
  48 {
  49         const PUBLIC_COLLECTION = 'https://www.w3.org/ns/activitystreams#Public';
  50         const CONTEXT = ['https://www.w3.org/ns/activitystreams', 'https://w3id.org/security/v1',
  51                 ['vcard' => 'http://www.w3.org/2006/vcard/ns#',
  52                 'diaspora' => 'https://diasporafoundation.org/ns/',
  53                 'manuallyApprovesFollowers' => 'as:manuallyApprovesFollowers',
  54                 'sensitive' => 'as:sensitive', 'Hashtag' => 'as:Hashtag']];
  55         const ACCOUNT_TYPES = ['Person', 'Organization', 'Service', 'Group', 'Application'];
  56         const CONTENT_TYPES = ['Note', 'Article', 'Video', 'Image'];
  57         const ACTIVITY_TYPES = ['Like', 'Dislike', 'Accept', 'Reject', 'TentativeAccept'];
  58         /**
  59          * @brief Checks if the web request is done for the AP protocol
  60          *
  61          * @return is it AP?
  62          */
  63         public static function isRequest()
  64         {
  65                 return stristr(defaults($_SERVER, 'HTTP_ACCEPT', ''), 'application/activity+json') ||
  66                         stristr(defaults($_SERVER, 'HTTP_ACCEPT', ''), 'application/ld+json');
  67         }
  68
  69         /**
  70          * Fetches ActivityPub content from the given url
  71          *
  72          * @param string $url content url
  73          * @return array
  74          */
  75         public static function fetchContent($url)
  76         {
  77                 $ret = Network::curl($url, false, $redirects, ['accept_content' => 'application/activity+json, application/ld+json']);
  78                 if (!$ret['success'] || empty($ret['body'])) {
  79                         return false;
  80                 }
  81
  82                 return json_decode($ret['body'], true);
  83         }
  84
  85         /**
  86          * Fetches a profile from the given url into an array that is compatible to Probe::uri
  87          *
  88          * @param string $url profile url
  89          * @return array
  90          */
  91         public static function probeProfile($url)
  92         {
  93                 $apcontact = APContact::getByURL($url, true);
  94                 if (empty($apcontact)) {
  95                         return false;
  96                 }
  97
  98                 $profile = ['network' => Protocol::ACTIVITYPUB];
  99                 $profile['nick'] = $apcontact['nick'];
 100                 $profile['name'] = $apcontact['name'];
 101                 $profile['guid'] = $apcontact['uuid'];
 102                 $profile['url'] = $apcontact['url'];
 103                 $profile['addr'] = $apcontact['addr'];
 104                 $profile['alias'] = $apcontact['alias'];
 105                 $profile['photo'] = $apcontact['photo'];
 106                 // $profile['community']
 107                 // $profile['keywords']
 108                 // $profile['location']
 109                 $profile['about'] = $apcontact['about'];
 110                 $profile['batch'] = $apcontact['sharedinbox'];
 111                 $profile['notify'] = $apcontact['inbox'];
 112                 $profile['poll'] = $apcontact['outbox'];
 113                 $profile['pubkey'] = $apcontact['pubkey'];
 114                 $profile['baseurl'] = $apcontact['baseurl'];
 115
 116                 // Remove all "null" fields
 117                 foreach ($profile as $field => $content) {
 118                         if (is_null($content)) {
 119                                 unset($profile[$field]);
 120                         }
 121                 }
 122
 123                 return $profile;
 124         }
 125
 126         /**
 127          * @brief
 128          *
 129          * @param $url
 130          * @param integer $uid User ID
 131          */
 132         public static function fetchOutbox($url, $uid)
 133         {
 134                 $data = self::fetchContent($url);
 135                 if (empty($data)) {
 136                         return;
 137                 }
 138
 139                 if (!empty($data['orderedItems'])) {
 140                         $items = $data['orderedItems'];
 141                 } elseif (!empty($data['first']['orderedItems'])) {
 142                         $items = $data['first']['orderedItems'];
 143                 } elseif (!empty($data['first'])) {
 144                         self::fetchOutbox($data['first'], $uid);
 145                         return;
 146                 } else {
 147                         $items = [];
 148                 }
 149
 150                 foreach ($items as $activity) {
 151                         ActivityPub\Receiver::processActivity($activity, '', $uid, true);
 152                 }
 153         }
 154 }